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Mixed type LED illumination circuit and control strategy thereof

A technology of LED lighting and LED circuit, applied in the field of LED light source, can solve problems such as heat dissipation difficulties, energy consumption of external current limiting resistors, damage of LED chips, etc., and achieve high efficiency, low cost, and low efficiency

Inactive Publication Date: 2014-06-11
刘晓博
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] DC LED is the mainstream of research in the packaging industry. The research direction is to improve the thermal resistance between the chip and SLUG, such as flip-chip and substrate packaging. The chip part is to improve the internal and external quantum efficiency or light extraction. Generally, the LED material As a research direction, DC LEDs have the following disadvantages: the current DC LEDs can only withstand low-voltage DC, and high-voltage or AC may damage the light-emitting diodes, so they must be used with DC conversion circuits before they can be used in commercial power systems and DC conversion systems. Generally, it consumes about 10% of the electric energy; low-voltage DC LED chips are easily damaged due to reverse voltage rise
However, the AC LED chip itself has disadvantages such as high cost, difficult insulation between grains, and difficulty in heat dissipation due to overly concentrated packaging methods; it also has stroboscopic flicker during use, energy consumption by external current-limiting resistors, and high external reactance needs to be used. The operating frequency of the LED and other issues

Method used

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  • Mixed type LED illumination circuit and control strategy thereof
  • Mixed type LED illumination circuit and control strategy thereof
  • Mixed type LED illumination circuit and control strategy thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 AC-DC Hybrid Circuit and Its Current Control and Power Control Strategy

[0052] figure 1 It is a schematic diagram of the principle of an AC-DC hybrid circuit, in which the AC LED is connected in series with the AC input end of the rectifier circuit of the DC LED drive circuit (the drive circuit includes a rectifier circuit), and the DC LED drive input side is called the DC side, and the DC LED drive output side is called the DC side. On the low-voltage side, the voltage on the DC side is u1, the voltage across the LEDs connected in series on the DC side is U2, and the voltage across the LEDs connected in series on the low-voltage side is U3. Due to the small internal resistance of the LED, U2 and U3 can take the LED threshold voltage for rough control Near fixed value, set the target current as i1r, and the current control strategy is:

[0053] Step 1: Obtain i2ref from given i1r, i2ref=i1r×u1÷U3;

[0054] Step 2: Limit i2ref, take the smaller of i2ref ...

Embodiment 2

[0067] Embodiment 2 DC Hybrid Circuit and Current and Power Control Strategy

[0068] image 3 , Figure 4 It is a schematic diagram of the principle of the DC hybrid circuit. The DC side LED is connected to the DC side power supply circuit of the DC LED drive circuit through a passive filter circuit or a parallel reverse voltage regulator diode or directly connected in series. image 3 Medium DC LED drive circuit includes PFC circuit, Figure 4 The middle rectifier circuit includes a PFC circuit, and the DC LED driver circuit does not include a PFC circuit. The DC side LED shares the input voltage of the DC LED driver, reducing the working voltage and output power of the DC LED driver, resulting in lower cost and higher efficiency. Let the input side of the DC LED drive be called the DC side, and the output side of the DC LED drive be called the low-voltage side. image 3 and Figure 4 The LED box on the middle DC side represents that the DC LED is connected in parallel wit...

Embodiment 3

[0075] Embodiment 3 AC-DC Hybrid Circuit Working at Higher Frequency

[0076] Figure 5 It is a schematic diagram of an AC-DC hybrid circuit working at a higher frequency. Figure 5 In the AC LED, the DC LED reverse-parallel voltage regulator diode is connected across the output end of the passive filter circuit, the output end of the passive filter circuit is connected across the output end of the half-bridge rectifier circuit, and the AC side of the half-bridge rectifier circuit is connected to the band The secondary side of the center-tapped transformer and the primary side of the transformer are connected in series with the DC LED drive circuit and the current limiting resistor R protection circuit.

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Abstract

The invention relates to a mixed type LED circuit. The mixed type LED circuit is characterized in that the power supply side of a controllable LED circuit is connected with a voltage-dividing LED in series, currents flowing through the voltage-dividing LED are regulated by controlling output power of an controllable LED, and therefore output power of the whole illumination circuit is controlled; the voltage-dividing LED can be an alternating-current LED and can also be a direct-current LED, and the controllable LED can be a direct-current LED and a drive of the direct-current LED and can also be an alternating-current LED and a drive of the alternating-current LED; as part of LEDs in the mixed type LED illumination circuit do not need driving circuits, higher efficiency is achieved, voltage resistance and power of the controllable LED circuit are low after voltage dividing conducted by the voltage-dividing LED connected in series, cost is lower, and the mixed type LED circuit is suitable for an illuminating system using high-voltage power supply like commercial power supply.

Description

technical field [0001] The invention belongs to the field of LED light sources, and in particular relates to a hybrid LED circuit, specifically a circuit in which AC LEDs and DC LEDs are mixed, and current limiting and current control are mixed. Background technique [0002] DC LED is the mainstream of research in the packaging industry. The research direction is to improve the thermal resistance between the chip and SLUG, such as flip-chip and substrate packaging. The chip part is to improve the internal and external quantum efficiency or light extraction. Generally, the LED material As a research direction, DC LEDs have the following disadvantages: the current DC LEDs can only withstand low-voltage DC, and high-voltage or AC may damage the light-emitting diodes, so they must be used with DC conversion circuits to be used in commercial power systems and DC conversion systems. Generally, it consumes about 10% of the electric energy; low-voltage DC LED chips are easily damage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
Inventor 刘晓博
Owner 刘晓博
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